The Renneckenberg (formerly Rennekenberg) is a mountain, roughly 933 metres (3,061 ft) high, in the High Harz part of the Harz mountain range of central Germany within the borough of Wernigerode in the state of Saxony-Anhalt.

Its summit rises about 300 metres east of the Kreisstraße (county road), the K 1356 or Brockenstraße, that runs from Schierke up to the highest mountain in the Harz, the Brocken (1141.1 m).

Towards the north-northwest the mountainsides of the Renneckenberg descend into the valley of the River Ilse; towards the northeast they lead towards the Hoher Wand (758 m) and the Ohrenklippen crags; and towards the east they drop into the valley Holtemme which rises on the mountain in the area where it transitions to the Hohnekamm (900.6 m, with its Hohneklippen) to the south-southeast.

To the west the countryside runs across to the Brocken via the Brockenbett through which the upper reaches of the Ilse flow.

On the forested Renneckenberg there are many rock formations - apart from the aforementioned Zeterklippen and Kapellenkind - that, apart from the Brockenkinder ("Brocken children", ca.